ICS843S1066 Datasheet, PDF (9/12 Pages) Integrated Device Technology – CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER

ICS843S1066
CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 6.
V_CC
Q1
V_OUT
RL
50Ω
V_CC - 2V
Figure 6. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage
of V_CC – 2V.
• For logic high, V_OUT = V_{OH_MAX} = V_{CC_MAX} – 0.8V
(V_{CC_MAX} – V_{OH_MAX}) = 0.8V
• For logic low, V_OUT = V_{OL_MAX} = V_{CC_MAX} – 1.6V
(V_{CC_MAX} – V_{OL_MAX}) = 1.6V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V_{OH_MAX} – (V_{CC_MAX} – 2V))/R_L] * (V_{CC_MAX} – V_{OH_MAX}) = [(2V – (V_{CC_MAX} – V_{OH_MAX}))/R_L] * (V_{CC_MAX} – V_{OH_MAX}) =
[(2V – 0.8V)/50Ω] * 0.8V = 19.2mW
Pd_L = [(V_{OL_MAX} – (V_{CC_MAX} – 2V))/R_L] * (V_{CC_MAX} – V_{OL_MAX}) = [(2V – (V_{CC_MAX} – V_{OL_MAX}))/R_L] * (V_{CC_MAX} – V_{OL_MAX}) =
[(2V – 1.6V)/50Ω] * 1.6V = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32mW
IDT™ / ICS™ 3.3V LVPECL CLOCK SYNTHESIZER
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ICS843S1066CG REV. A AUGUST 27, 2008